Improvement in furnaces for grain-driers



0 2. Sheetsr-Sheet I. COGSWELL & WILLIAMS.

Furnace for Grain Driersu No. 40.090. Patented Sept. 29, 1863.

' COGSWELL & WBLLlAMS.

Furnace for Grain Driers. I No. 40.090. Patented Sept. 29, 1863.

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UNITED STATES PATENT OFFICE.

ADDISON G. WILLIAMS AND MORTIMER C. COGS WELL, OF BUFFALO, NEW YORK.

IMPROVEMENT IN FURNACES FOR GRAIN-DRIERS.

Specification forming part of Letters Patent No. 40,090, dated September 29, 1863; antedated September 20, 1863.

To all whom, it may concern/.

Be it known that we. ADDISON G. WILLIAMS and MORTIMER G. CoGswELL, of the city of Buffalo and State of New York, have invented an Improvement in Furnaces for Heating Air for Grain-Briers; and we do hereby declare that the following is a full and exact description of the construction and operation thereof, reference being had to the accompanying drawings, making a part of this specification, in which Figure I is a vertical longitudinal section, and Fig. II is a plan.

Letters of like name and kind refer to like parts in each of the figures.

The nature of this invention relates to an improvement in the arrangement of the flues, fire-grate, and hot-air chamber in furnaces for heating air for grain-driers, by which a more perfect control, regulation, and efficiency of the fire and hotair blast is obtained.

A represents the main outside walls of the branch flue, G which taps the middle flue, O,

and passes through the wall B to the under side of the fire-grate F, and supplies the fire with the draft-current of air. leach of these flues takes air from the common air chamber G of the blower H. The flue D opens over the fire and into the hot-airchamber E. Each of these flues is provided with a valve or damper by which the currents of air are regulated. The valves for the outside flues are shown at I J. The central flue, G, hasavalve. which is shown at K, and the branch flue O has a valve, which is shown at L.

M is a large pipe which opens into the hotair chamber E and conducts the hot air from thence to the grain-drier.

The smoke and gas arising from the fuel is all consumed in the chamber E, so that pure hot-air only is conducted to the drier.

N is a door through which fuel is supplied to the fire.

O is a door opening into the ash-pit.

The arrows show the direction of the aircurrents.

Operation: When the fire is to be kindled on the grate F, the valves 1, J, and K will be closed, and the valve L opened. The blower will then force a strong current of air through the flue C under the grate and through the coal or fuel lying thereon. When the fire is sufficiently lighted, the valves I J K may be opened and allow a portion of the air to pass through the under flues into the wide flue D, and thence over the fire and into the chamber E. It the fire is getting too hot, the valve L may be wholly or partially closed, and throw the whole or a major part of the air over the fire. It more air is being supplied than the furnace will heat, or more than is required to be used in the driers, then by this arrangment of the flues and valves the supply over the fire may be shut off in whole or in part as required; or if the fire needs to be increased, then the valve L is opened, so as to increase the draft through the fuel, and hence by this arrangement the most perfect control over the fire and the supply of air is obtained. By this arrangment the air is or may be heated to any required degree, and furnished in any required quantity for drying grain in any of its varying conditions in which it may be when subjected to the drying process.

lVe claim-- In a furnace for heating air for the purpose of drying grain, the arrangement of the flues O O 0 G and D, (including their valves,) relatively with the blower H, hot-air chamber E, and pipe M, for the purposes and substantially as described.

ADDISON G. WILLIAMS. MORTIMER O. COGS WELL.

WVitnesses:

E. B. FORBUSH, E. OSBORNE. 

